I was searching on YT but found no videos on 5th gen Prius Hybrid Battery Fan filter maintenence so i dig into it myself and it was easier than Corolla Hybrid, no screws etc. I made a quick video showing how to do it for others who might be looking on YT for one like me:
This is for a hev model, not a phev model. The phev battery is cooled/heated by the climate control system liquid/gas refrigerant (heat pump).